Microstructures of Al/Al2O3 composite bodies obtained by reaction between SiO2 and molten Al at temperatures ranging from 1073 to 1473 K

Noboru Yoshikawa, Atsushi Kikuchi, Shoji Taniguchi

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10 Citations (Scopus)

Abstract

Al/Al2O3 composite bodies were fabricated by reaction between SiO2 (vitreous silica) rods and molten Al at temperatures between 1073 and 1473 K. Microstructures of the composite bodies were observed using an optical microscope (OM), a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Specimens reacted at 1073 K had `feather-like' microstructures consisting of aggregates of Al2O3 grains, which had submicron scales. Specimens reacted at 1173 K had two kinds of microstructures. One was also composed of fine grains and the other had `bone-shaped' Al2O3 areas with scales of several micrometers. The latter microstructure became dominant in the specimens reacted above 1273 K. Specimens reacted above 1373 K had microstructures consisting of Al2O3 networks which had winding and rounded shapes. According to TEM observation, equi-axed Al2O3 grains were connected and had the same crystallographic orientations, and they formed elongated areas in the networks. Formation mechanism of the composite microstructures was discussed by comparing the scales and morphologies of the Al2O3 grains at different reaction temperatures.

Original languageEnglish
Pages (from-to)399-405
Number of pages7
JournalMaterials Transactions, JIM
Volume41
Issue number3
DOIs
Publication statusPublished - 2000 Mar

ASJC Scopus subject areas

  • Engineering(all)

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